Cows and goats which have recently given birth can also carry similar infections.

Dr Gerry Waldron at the PHA, said: "The number of reports of these infections and human miscarriages resulting from contact with sheep is extremely small. However, it is important that pregnant women are aware of the potential risks."

To avoid the possible risk of infection, pregnant women are advised they should not help to lamb or milk ewes and avoid contact with aborted or new-born lambs or any bedding or clothing which may have come into contact with ewes or lambs.